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2 years ago

Can someone please help me

Physics

1 answer:

mario62 [17]2 years ago

8 0

Answer:

GE = ME - $\frac{1}{2} m\,v^2$ , which agrees with option C in your list.

Explanation:

The definition of Mechanical Energy (ME) of a system is the addition of the gravitational potential energy (GE) plus the kinetic energy (KE) of the system:

ME = GE + KE

Given that the KE is: $\frac{1}{2} m\,v^2$ ,

solving for GE in the formula above gives:

GE = ME - KE = ME - $\frac{1}{2} m\,v^2$ , which agrees with option C

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Light with wavelength 575 nm goes through a single slit of width 0.036 mm and displays a diffraction pattern on a screen 4.2 m a

Alex787 [66]

Answer:

momentum = 1.147 × $10^{-34}$ kg-m/s

Explanation:

given data

wavelength = 575 nm = 575 × $10^{-9}$ m

slit width S = 0.036 mm = 0.036 × $10^{-3}$ m

diffraction pattern D = 4.2 m

to find out

width of central bright fringe, angle of 3rd dark fringe and momentum of photon

solution

we will apply here formula for central bright fringe width formula that is

width = $\frac{2*wavelength*D}{S}$ ...............1

put here all these value

width = $\frac{2*575*10^{-9}*4.2}{0.036*10^{-3}}$

width = 0.134 m

so width of central bright fringe is 0.134 m

and

for angle we will formula

slit width × sin∅ = n × wavelength ............2

here n is no of dark fringe

put here value and find angle

0.036 × $10^{-3}$ × sin∅ = 3 × 575 × $10^{-9}$

solve and we get

∅ = 2.75°

so angle to the 3rd dark fringe is 2.75°

and

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2 years ago

Which of the following is an example in which you are traveling at constant speed but not at constant velocity?

grin007 [14]

Answer:

c) Driving around in a circle at exactly 100 km/hr.

This examples represents constant speed but not constant velocity.

Explanation:

To answer this question it is importan to know the difference between the concept of speed and velocity.

speed: Is the ratio of change in the displacement per unit of time. JUST A MAGNITUDE

velocity: Is the ratio of change in the displacement per unit of time in a given direction. It is a composed value by magnitude and direction, this is know as a VECTOR.

So, in conclusion the speed is the magnitude or the scalar value, for the velocity vector.

In the example,

in a) Rolling freely down a hill in a cart, traveling in a straight line. There is a component of acceleration, from earth gravity, so the speed is changing.

in b) Driving backward at exactly 50 km/hr. The direction and speed are the same, so speed and velocity are constant.

In d) Jumping up and down, with a period of exactly 60 hops per minute. There are changes in the speed, due to the acceleration and decceleration between the changes in the direction. Actually you have to stop to change direction between the ups and downs in the jumps. Also there is the gravitational component, always changing the speed.

In c) Driving around in a circle at exactly 100 km/hr. In this case the speed remains constant, while the direction is changing all the time.

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2 years ago

Can someone please help me​

Can someone please help me